#include<iostream>
using namespace std;
class A
{
protected:
	int _a = 1;
	static int _num;
private:
	int _sum = 3;
};
static int _num = 2;
class B : public A
{
private:
	int _b = 4;
};
int main()
{
	A a;
	B b;
	return 0;
}